Speetoniceras versicolor Hauterivian Shilovka, Wolga, Russia Large, with well-defined ridge structures, red iridescence is seen throughout an ammonite of deep brown/black coloration. Ammonites arose during the Devonian Period and met their end, along with the dinosaurs, during the K-T extinction. The closest living relative of the ammonite is the chambered nautilus. Diameter measures 13 1/2in
Speetoniceras versicolor Hauterivian Shilovka, Wolga, Russia Large, with well-defined ridge structures, red iridescence is seen throughout an ammonite of deep brown/black coloration. Ammonites arose during the Devonian Period and met their end, along with the dinosaurs, during the K-T extinction. The closest living relative of the ammonite is the chambered nautilus. Diameter measures 13 1/2in
.jpg "Source: Christie's")
.jpg "Source: Christie's")
.jpg "Source: Christie's")
.jpg "Source: Christie's")
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.jpg "Source: Christie's")
.jpg "Source: Christie's")
